LOCATION MUGWUMP OR
Established Series
IRD. JLW/RJO/DAL/KMS
02/2019
MUGWUMP SERIES
Landscape--mountains
Landform--planar and complex terraces on mountain valley floors
Slope--0 to 30 percent
Parent material--alluvium derived from mixed sources
Mean annual precipitation--about 680 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Cumulic Hapludolls
TYPICAL PEDON: Mugwump sandy loam in an area of woodland, on a 3-percent slope at elevation of 1335 m
Oi--0 to 5 cm; slightly decomposed plant material consisting of needles and twigs
Oe--5 to 8 cm; moderately decomposed plant material
A1--8 to 23 cm; sandy loam, dark brown (7.5YR 3/2) dry, very dark brown (10YR 2/2) moist; weak fine and very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, medium, and coarse roots; few very fine and fine tubular pores; neutral (pH 7.0); clear smooth boundary
A2--23 to 38 cm; sandy loam, dark brown (10YR 3/3) dry, very dark brown (7.5YR 2.5/2) moist; weak fine and very fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine, fine, and coarse and many medium roots; few very fine and fine tubular pores; 10 percent gravel; slightly acid (pH 6.5); clear smooth boundary
Bw1--38 to 71 cm; very cobbly sandy loam, brown (10YR 4/3) dry, dark brown (10YR 3/3) moist; weak medium and fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine, fine, and medium and few coarse roots; few very fine, fine, and medium tubular pores; 20 percent gravel, 10 percent cobbles, and 5 percent stones; slightly acid (pH 6.5); gradual, smooth boundary
Bw2--71 to 135 cm; extremely stony sandy loam, brown (10YR 4/3) dry, dark brown (7.5YR 3/3) moist; weak fine and very fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and few fine, medium, and coarse roots; few very fine tubular pores; 25 percent gravel, 20 percent cobbles, and 15 percent stones; neutral (pH 6.6); gradual smooth boundary
BC--135 to 150 cm; extremely stony sandy loam, brown (10YR 4/3) dry, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and few fine and medium roots; few very fine tubular pores; 25 percent gravel, 25 percent cobbles, and 20 percent stones and boulders; slightly acid (pH 6.5)
TYPE LOCATION: Union County, Oregon, about 593 m south and 724 m west of the northeast corner of section 6, T. 5 S., R. 42 E.; latitude 45.1603211, longitude -117.6105415, datum WGS 84 (coordinates and PLSS details estimated from point on hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--6 to 8 degrees C
Mean summer soil temperature--10 to 13 degrees C
Mean winter soil temperature--1 to 3 degrees C
Thickness of mollic epipedon--90 to 150 cm
Soil moisture--dry 25 to 45 days in summer
Particle-size control section
*Clay content--3 to 12 percent
*Total rock fragment content--45 to 80 percent
A horizon
Moist color--7.5YR 2.5/1, 7.5YR 2.5/2, 7.5YR 3/1, 7.5YR 3/2, 10YR 2/2
Dry color--7.5YR 3/2, 7.5YR 4/2, 7.5YR 4/3, 10YR 3/3, 10YR 4/3
Fine-earth texture--loam, sandy loam, loamy sand
Clay content--2 to 12 percent
Sand content--10 to 75 percent
Organic matter content--2 to 6 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 20 percent
Cobble content--0 to 10 percent
Reaction--6.1 to 7.3
Base saturation--55 to 85 percent (sum of bases)
Thickness--31 to 66 cm
Bw horizon
Moist color--7.5YR 2.5/1, 7.5YR 2.5/2, 10YR 3/3
Dry color--7.5YR 4/1, 7.5YR 4/2, 7.5YR 4/3, 10YR 4/3
Fine-earth texture--sandy loam
Clay content--2 to 12 percent
Sand content--50 to 70 percent
Organic matter content--0.5 to 1.5 percent
Total fragment content--35 to 75 percent
Gravel content--20 to 40 percent
Cobble content--10 to 20 percent
Stone content--5 to 20 percent
Reaction--6.1 to 7.3
Base saturation--70 to 85 percent (sum of bases)
Thickness--50 to 100 cm
BC horizon
Moist color--7.5YR 2.5/2, 7.5YR 3/2, 10YR 2/2, 10YR 3/3
Dry color--7.5YR 4/1, 7.5YR 4/2, 10YR 4/3, 10YR 4/2
Fine-earth texture--loamy sand, sand, sandy loam
Clay content--2 to 6 percent
Sand content--10 to 75 percent
Organic matter content--2 to 6 percent
Total rock fragment content--0 to 15 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Reaction--6.1 to 7.3
Base saturation--70 to 85 percent (sum of bases)
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1140 to 1630 m
Climate--cold, wet winters; warm, moist summers
Mean annual precipitation--480 to 1190 mm
Mean annual air temperature--4 to 7 degrees C
Frost-free period--40 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Dardry--on high terraces of mountain valley floors
Melloe--on flood plains of mountain valley floors
Rebarrow--on high terraces of mountain valley floors; thick mantle of volcanic ash
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high, very high in the lower part
USE AND VEGETATION:
Use--timber production, watershed, wildlife, recreation, livestock grazing
Potential native vegetation--grand fir, Douglas-fir, ponderosa pine, Douglas maple, Engelmann spruce, western larch, redosier dogwood, common snowberry, elk sedge, pinegrass, white spirea, blue wildrye, alder, stink currant, prickly currant, American vetch, largeleaf sandwort, low Oregon grape, heartleaf arnica, showy aster, tailcup lupine
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Union County, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--zone from 8 to 135 cm
*Particle-size control section--zone from 33 to 108 cm
National Cooperative Soil Survey
U.S.A.